||MCQS for JEE and AIPMT || HOME
TOPIC:: d - BLOCK ELEMENTS : PAGE#53
CLICK ON THE CORRECT OPTION,
TO GET SOLUTION, CLICK ON SOLUTION

Q209) Number of moles of k2Cr2O7 reduced by one mole of Sn2+ ion is ..[ Haryana CEET 1996]




SOLUTION

Cr2O72- + 14H+ + 6e- → 2Cr3+ + 7H2O
Sn2+ → Sn4+ + 2e-
1 M of Sn2+ in the process of oxidation gives 2e-
Now 6e- reduce 1M of Cr2O72- completely
then 2e will reduce (M/6) × 2 = (M/3)
Or (1/3) moles of K2Cr2O7
Answer: (a)


Q210) Amongst TiF62-, CoF63-, Cu2Cl2 and NiCl42- ( At. No. Ti = 22, Co = 27, Cu = 29, Ni = 28). the colourless species are .. [ CBSE PMT 1995]




SOLUTION

TiF62- contains Ti4+ ( d0 configuration) and Cu2Cl2 contains Cu+ (d10 configuration) which are colourless species
Answer: (d)


Q211) Turnbull's blue is a compound called? [ Bihar CEE 1995]



SOLUTION

Ferrous ferrocyanide Fe2[Fe(CN)6] is Turnbull's blue and ferric ferrocyanide Fe4[FE(CN)6]3 is Prussian blue
Answer:(b)



Q212) Among the lanthanides the one obtained by synthetic method is .. [ CBSE PMT 1994]



SOLUTION

Promethium (Pm) is obtained by synthetic method
Answer: (b)


logo
All contents ©Copyright 2013 www.gneet.com
Site Design © 2013 All Rights Reserved Gore Coaching Classes